Dispensing – Processes of dispensing
Patent
1987-07-31
1989-07-25
Shaver, Kevin P.
Dispensing
Processes of dispensing
222 55, 222 63, 222 75, 222330, 222333, 239 76, 417 18, 417 38, B67D 512
Patent
active
048505137
ABSTRACT:
A control system and method is disclosed for a plaster pump 10. A pair of nozzles A, B dispenses material pumped from the nozzle and are connected by a "Y"-branch 50 in supply lines 11a and 11b to pump manifold 10a. Actual pressure signals 14a are compared in a comparator 16 to preset pressure signal 28. A differential pressure signal 16a is delivered to a signal switch 34 which controls a throttle driver 38 to control throttle 40 and pump 10. The pump may be throttled up or down to satisfy the pressure difference and bring the pressure to the desired preset pressure. An actual pressure signal 14c is delivered to an overpressure comparator circuit 26. An upper pressure limit signal 28a is compared to actual pressure by comparator 26. If an overpressure condition exists, an overpressure signal 26a is sent to signal switch 32 which shuts off or idles down the pump. If either nozzle A or B is shut off, a nozzle-off signal at 64a is sent to logic controller E. Switches 32 and 34 are off and signal switch 66 is open. Pressure compensator circuit 68 divides the pressure in half and provides an adjusted preset pressure signal at 68a. Comparator 70 compares the adjusted preset pressure signal at 68a to actual pressure signal at 14d. An adjusted differential pressure signal 70a is delivered to signal switch 66. Pressure will be reduced to one-half that of the original preset pressure.
REFERENCES:
patent: 2432671 (1947-12-01), Longenecker
patent: 4324366 (1982-04-01), Geier et al.
patent: 4516700 (1985-05-01), Guzowski
patent: 4545504 (1985-10-01), Fabel et al.
patent: 4662540 (1987-05-01), Schroter
patent: 4667852 (1987-05-01), Siemann
patent: 4682710 (1987-07-01), Turner, Jr. et al.
patent: 4700205 (1987-10-01), Rich et al.
Flint Cort
Shaver Kevin P.
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